74 Duster (318) cranks, but no start. Need help.

1....Check for spark

"Rig" a test gap or wide gap spark plug to the coil tower. Use solid wire even low voltage wire "in space." Crank using the key not by jumpering the relay. You should get a nice blue spark at least 3/8 and more like 1/2 inch

2....If weak or no spark, hook meter to coil plus. Turn on key. voltage should range from around 6 ish to about 10V If near battery, near 12V it means module is not drawing current. If really lower it means ballsat is not getting full voltage from key/ bulkhead. Measure voltage at ballast from "key"

3...With meter on coil + as before crank engine using the key. Voltage should be very close to battery cranking voltage, IE 11v or so. You want to see at least 10.5 and absolutely no less than 10

This of course depends on whether battery is down or bad or old etc

4....If you have just installed dist you can check timing on the starter